问题背景:如图,四边形
中,
,
,
,
,
,
为边
上一动点,连接
、
.
问题探究
(1)如图1,若
,则
的长为__________.
(2)如图2,请求出
周长的最小值;
(3)如图3,过点
作
于点
,过点
分别作
于
,
于点
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
①是否存在点
,使得
的面积最大?若存在,求出
面积的最大值,若不存在,请说明理由;
②请直接写出
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb24be4fa6d823eff33e7797d337c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6834ac70927ae08d7d36a1922403c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
问题探究
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfddba15eea41271e929114b41cc317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)如图2,请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
(3)如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddade54fa8a7cc4b0a7914761d48102e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d0d3ac8f3f181d54743d2151158942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
①是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
②请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/4429c795-b20a-4dd0-a064-c55ffa06b049.png?resizew=375)
更新时间:2020-05-02 13:51:44
|
相似题推荐
解答题-问答题
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困难
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【推荐1】已知:如图,菱形ABCD中,对角线AC,且AC=12cm,BD=16cm.点P从点B出发,速度为1cm/s;同时,点Q沿DB方向匀速运动,速度为1cm/s,且与AD,BD,Q,F;当直线EF停止运动时,点P也停止运动.连接PF(s)(0<t<8).解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/33e012cd-a2ac-4d8d-ab8d-f095119c4f98.png?resizew=185)
(1)当t为何值时,四边形APFD是平行四边形?
(2)设四边形APFE的面积为y(cm2),求y与t之间的函数关系式;
(3)是否存在某一时刻t,使S四边形APFE:S菱形ABCD=17:40?若存在,求出t的值,并求出此时PE的长度;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/33e012cd-a2ac-4d8d-ab8d-f095119c4f98.png?resizew=185)
(1)当t为何值时,四边形APFD是平行四边形?
(2)设四边形APFE的面积为y(cm2),求y与t之间的函数关系式;
(3)是否存在某一时刻t,使S四边形APFE:S菱形ABCD=17:40?若存在,求出t的值,并求出此时PE的长度;若不存在,请说明理由.
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【推荐2】在直角坐标系中,过原点O及点A(8,0),C(0,6)作矩形OABC,连接OB,点D为OB的中点,点E是线段AB上的动点,连接DE,作DF⊥DE,交OA于点F,连接EF.已知点E从A点出发,以每秒1个单位长度的速度在线段AB上移动,设移动时间为t秒.
(1)如图1,当t=3时,求DF的长.
(2)如图2,当点E在线段AB上移动的过程中,
的大小是否发生变化?如果变化,请说明理由;如果不变,请求出
的值.
(3)连接AD,当AD将△DEF分成的两部分的面积之比为1:2时,求相应的t的值.
(1)如图1,当t=3时,求DF的长.
(2)如图2,当点E在线段AB上移动的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0adb2ce8ae23fe6d06d569c9f75be3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0adb2ce8ae23fe6d06d569c9f75be3.png)
(3)连接AD,当AD将△DEF分成的两部分的面积之比为1:2时,求相应的t的值.
![](https://img.xkw.com/dksih/QBM/2019/11/12/2332128313417728/2332291482361856/STEM/6d35bc78a49d4757a0b8085850c4306e.png?resizew=376)
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【推荐1】(1)问题提出:如图1,
为等边三角形,
于点
,点
为边
上一点,请画出
上所有使
的点
.
(2)问题解决:如图2,四边形
中,
,
,
,
,
,
为四边形
内部一点,且
,作
,交射线
于点
.
①当
为直角三角形时,求
的长;
②
是否存在最小值?若存在,请求出
的最小值;若不存,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cedc6911d02394383004ef17213ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/223de756-f7a0-4f89-9a70-207f99b48ed5.png?resizew=132)
(2)问题解决:如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfac9ab1dc776c9ec076ab2a132fcd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a91146605aff8a321203a5907143cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b95105d5ef14b9493a86729f788574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8fdf619ea7279debaa8beed03d64ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/e0ae98e7-a666-43bc-a662-0c2c44350c39.png?resizew=441)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d06fad1ed5a452a835e9a02cb011ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】【问题探究】
(1)如图
,某设计院欲规划一块三角形草坪,在如图
所示的
中,
,
,园林设计师乐乐要在该草坪上设计一条小路
.请用尺规在边
上找一点
,使得
(不写作法,保留作图痕迹);
(2)如图
,有一块边长为
的正方形花园,点
、
为花园的入口,且
,连接
.若在
区域内设计一个亭子
(亭子的大小忽略不计),满足
,从入口到亭子铺设两条景观路
和
.
点
运动路径的长是______m;
已知铺设小路
所用的景观石材每米的造价是
元,铺设小路
所用的景观石材每米的造价是300元,是否存在点
,使铺设小路
和
的总造价最低?若存在,求出最低总造价,并求出此时亭子
到边
的距离;若不存在,请说明理由.
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1731e7adb9e3fd4cc15f7f8a9fe3f320.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1611d15c7e1e4ab4a4a61537b3989d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a3a39af9fed6c70be34f2b26385f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/755fa2492502a7c1dd2d395bab8260cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】如图1,抛物线
经过点
,与
轴交于点
,与
轴交于点
,且
.
(1)求抛物线的解析式;
(2)将
沿
翻折得到
,直线
交抛物线于点
,求点
的坐标;
(3)如图2,若点
为直线
上一点(不与
、
重合),连接
,将
绕点
旋转
,得到线段
,是否存在这样的点
,使点
恰好在抛物线上?若存在,请直接写出点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eaad106bbff5bbffe8ae2095ed52270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/15c0d604-5be5-4b96-baca-9d79c4e39617.png?resizew=366)
(1)求抛物线的解析式;
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】如图1,已知正方形
的边长为10,点E是边
上的一个动点(点E不与点C重合),过点E与边
平行的直线交对角线
于点
,作射线
并将其绕点F顺时针旋转
,交
于点G.
(1)当
时,求
的长;
(2)当
为等腰三角形时,
的长为______;
(3)如图2,作
的外接圆,圆心为点O.当点E从(1)中的点E位置运动到点D的过程中,点O也随之运动,求点O运动路径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/737a687e-7ba6-42f2-8a0a-ce1f595bd0b2.png?resizew=324)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd9311e5295f10061deb2872fe04af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd9311e5295f10061deb2872fe04af5.png)
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解答题-证明题
|
困难
(0.15)
【推荐1】如图,在平面直角坐标系中,
为原点,四边形
是矩形,点
,
的坐标分别是
和
,点
是对角线
上一动点(不与
,
重合),连接
,作
,交
轴于点
,以线段
,
为邻边作矩形
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/4e80d2bf-c27b-4fcc-b320-97eeb4d7937b.png?resizew=449)
(1)填空:点
的坐标为 ;
(2)是否存在这样的点
,使得
是等腰三角形?若存在,请求出
的长度;若不存在,请说明理由;
(3)①求证:
=
;②设
,矩形
的面积为
,求
关于
的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40630a669f4eedf626bc24851df10c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99a532f9affc56784a17c4fcaab209e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acc4078a620e18f5bdd8621d5c9952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/4e80d2bf-c27b-4fcc-b320-97eeb4d7937b.png?resizew=449)
(1)填空:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)是否存在这样的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bb00358e70a667f5d03c1560362655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】在
中,
,点E是
内部的一点,连接
,且
,延长
交
于点D.
,求
的长.
(2)如图2,过点A作
交
的延长线于点F,过点B作
交
于点M,求证:
.
(3)如图3,在(1)问的条件下,点H是
的中点,点О是直线
上的动点,连接
,将
沿
翻折得到
,连接
,直接写出当
取最小值时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea71984f1e84123b0abe5ba92cb177cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2703dc83806b3ff028311876c6c0d20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98edef8531283edd45ec598a7a43f4d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7320de2ecab846f005566669fdafeaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30c40bf14c47463eea4be6e722f3a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8e875a951bb8d39ce292f860599f24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a511ac2ea12e3e5ddaef3b4f2cdc9a.png)
(3)如图3,在(1)问的条件下,点H是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada91d8fd8e6d5246e8dc23b1264fa14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da5ec61847f0b607242437ce5be3ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8ef5ce7ab3870992a39adb047e34ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0574b0d62d119045a732376a69f557b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b3b7e021c93cbe99d78153b3455781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87871d6ac5fca1a2edd9c5ccc5c422dd.png)
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